The research progress in Al

3

Sc/Al

3

(Sc

x

M

1-x

)particles in the scandium-containing aluminum alloy under the multi-component system was reviewed.Al

3

Sc/Al

3

(Sc

x

M

1-x

)particles is the key to improve the performance of the scandium-containing aluminum alloy.Al

3

Sc/Al

3

(Sc

x

M

1-x

)particles can be acted as the grain heterogeneous nuclei when the alloy liquid is solidified

so that the influence of the dendrites is weakened or eliminated

and as-cast crystal grains are also refined.Al

3

Sc/Al

3

(Sc

x

M

1-x

)particles can be also precipitated dispersively during deformation and heat treatment of aluminum alloy

thus inhibiting the nucleation and growth of recrystallized grains.It can also increase the recrystallizing temperature of the alloy

pining dislocation and subgrain boundary

hindering and preventing dislocation movement and subgrain boundary migration and merging

which improve the strength of the alloy.In multicomponent alloy system

the nucleation and growth of Al

3

Sc/Al

3

(Sc

x

M

1-x

)particles are much more complex than that of Al

3

Sc particles

so it is difficult to predict theoretically according to LSW model in most cases.The research methods of nucleation and growth of Al

3

(Sc

x

M

1-x

)particles were also summarized

of which the calculation method is an effective method to understand the nucleation and growth of Al

3

Sc/Al

3

(Sc

x

M

1-x

)particles.